Mathmagical - Algebra - What you should know!

letters can be used to represent numbers

4 + X = 10 means X = 10 - 4

5 x n is written as 5n

'add 5 to a number' is written as ' n + 5'
'A number times 3' is written as '3 x n' OR '3n'
'a number times itself' is written as 'n x n' OR 'n²'
'n divided by m' is written as 'n/m'

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Equals means equals!! - Be careful how you use it :
4 x n = 16 = n = 4 (NO!!)